16502 on Audi
Engine Coolant Temperature Sensor (G62): Signal too High
16502 on Audi vehicles indicates engine coolant temperature sensor (g62): signal too high. Au7o has documented this code across 1 Audi model — most commonly on A4. VAG/VCDS fault code 16502 corresponds to OBD-II code P0118 (Ross-Tech address 000280). It indicates the engine control module detected an abnormally high voltage signal from the Engine Coolant Temperature (ECT) sensor G62. High voltage is read as an implausibly cold engine (often colder than ambient), typically caused by an open circuit or failed sensor, and can disrupt cold-start fueling, idle, and the cooling-fan/warm-up strategy. Typical repair costs on Audi range from $30 to $180, depending on the specific model and root cause.
Common Causes of 16502
- •Faulty engine coolant temperature sensor (G62) reading out of range
- •Open or broken wiring in the ECT sensor signal circuit
- •Corroded, loose, or damaged sensor connector / poor ground
- •Loss of ground reference to the sensor
- •Low coolant level or air in the cooling system affecting the sensor
- •Failed or faulty engine control module (rare)
16502 on Audi by Model
Audi A4(1 issue)
- G62 Engine Coolant Temperature Sensor (black-housing) fails causing erratic temp gauge, hard cold starts and rich-running1996-2001
The original black-housing dual coolant temperature sensor (G62) mounted in the coolant flange at the back of the cylinder head develops cracks and fails internally. The temperature sensor G2 (also known as G62) for the gauge has likely failed and is relatively easy to fix; it is located in the coolant flange at the back of the cylinder head and the early square-connector style and later elongated D-shaped black connector sensors are known problematic units. When it fails the ECU sees an implausible coolant temperature, leading to cold starting difficulties at low temperatures, poor idle and acceleration during warm up as well as an erratic or dead temperature gauge.
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View 16502 across all makes →Frequently Asked Questions
What does 16502 mean on Audi?▼
16502 stands for "Engine Coolant Temperature Sensor (G62): Signal too High." VAG/VCDS fault code 16502 corresponds to OBD-II code P0118 (Ross-Tech address 000280). It indicates the engine control module detected an abnormally high voltage signal from the Engine Coolant Temperature (ECT) sensor G62. High voltage is read as an implausibly cold engine (often colder than ambient), typically caused by an open circuit or failed sensor, and can disrupt cold-start fueling, idle, and the cooling-fan/warm-up strategy. On Audi specifically, this code is documented across 1 model.
What causes 16502 on Audi vehicles?▼
Common causes on Audi: Faulty engine coolant temperature sensor (G62) reading out of range, Open or broken wiring in the ECT sensor signal circuit, Corroded, loose, or damaged sensor connector / poor ground, Loss of ground reference to the sensor, Low coolant level or air in the cooling system affecting the sensor. Specific causes vary by model and year — see the per-model sections below.
How much does it cost to fix 16502 on a Audi?▼
Repair costs on Audi range from $30 to $180, depending on the specific model and root cause.
Which Audi models have 16502 documented?▼
Au7o has documented 16502 on 1 Audi model: A4.